Club Penguin is an MMOG involving a virtual world containing a range of online games and activities, developed by Club Penguin Entertainment . Using cartoon penguins as avatars, players waddle around, chat, play minigames and participate in other activities with one another in a snow-covered virtual world. After beta-testing, Club Penguin was made available to the general public on October 24, 2005 and has since expanded into a large online community — growing to the extent that by late 2007, it was claimed that Club Penguin had over 12 million user accounts. While free memberships are available, revenue is predominantly raised through paid memberships which allow players to access a range of additional features, . The success of Club Penguin led to New Horizon being purchased by The Walt Disney Company in August 2007 for the sum of $350 million, with an additional $350 million in bonuses should specific targets be met by 2009.

The game is designed for children between the ages of 6 and 14 years old. Thus a major focus of the developers has been on child safety, with a number of features introduced to the game to facilitate this — including offering an "Ultimate Safe Chat" mode, whereby users select their comments from a menu; filtering that prevents swearing and the revelation of personal information; and moderators who police the game. Nevertheless, the game has had a degree of criticism, including claims that it teaches consumerism and that some players "cheat" to improve their status.